Nut upsuser - Oct 2015 - upsmon Poll UPS "Driver not connected" messages

I use the NUT RPM package for CentOS 6.7, which is version 2.6.5-2.

I am testing implementation of NUT features with APC and Tripp-Lite USB UPS
interfaces.  Things are going reasonably well.  However, I'm seeing many
more messages than I would like in /var/log/messages when I boot the system
without the UPS connected.  I have configured NOCOMMWARNTIME 3600, which takes
care to only broadcast to logged in terminals and send me emails once an hour. 
However, /var/log/messages is being filled with "upsmon[2391]: Poll UPS
[tripplite at localhost] failed - Driver not connected" messages every five
seconds.  I cannot seem to find a way to reduce that chatter.

These messages originate in pollups() in clients/upsmon.c.  It looks to me like
pollups() sees the utype_t->status flag ST_CONNECTED set, yet the
UPSCONN_t->fd is -1, which means there is no valid connection
(upscli_sendline() in clients/upsclient.c sets UPSCONN_t->upserror =
UPSCLI_ERR_DRVNOTCONN).  If ST_CONNECTED was clear, the connection would be
retried.  It appears to me that because ST_CONNECTED is set, pollups() thinks it
should have a good connection and is surprised to find out it does not.  Thus,
it always writes the "Driver not connected" message to
/var/log/messages.  This looks like an incorrect ST_CONNECTED state in the
utype_t->status flag.

I know I can slow down the polling interval.  But, I really don't want to do
that.  That reduces, but does not really eliminate filling /var/log/messages
with all these messages.

Larry Baker
US Geological Survey
650-329-5608
baker at usgs.gov



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